Bimetallic NiMnOx catalysts enable cascade C–H and C–C bond cleavage for efficient low-temperature ethane oxidation

IF 8.1 1区 工程技术 Q1 ENGINEERING, CHEMICAL
Qianqian Gao, Jiali Tang, Jinhang Yang, Beilong Lin, Peirong Chen, Mingli Fu, Daiqi Ye, Yun Hu
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Abstract

Transition metal oxide catalysts offer a cost-effective and efficient alternative to noble metal catalysts for the environmental treatment of light alkane pollutants. In this study, a bimetallic Ni0.2Mn0.8Ox catalyst was evaluated for its effectiveness in the low-temperature catalytic oxidation of ethane, which achieved an ethane conversion of 90 % at only 286 °C and exceeded 99 % at 325 °C. Under conditions of poisoning with 5 vol% H2O or 10 ppm H2S for 10 h, the activity of the Ni0.2Mn0.8Ox catalyst remained essentially unchanged. The characterization results indicated that the Ni sites on the surface of Ni0.2Mn0.8Ox were favorable for the adsorption of ethane. Simultaneously introducing Ni promoted lattice distortion in MnOx and increased the exposure of lattice oxygen to participate in the reaction. In mechanistic studies, it was elucidated that the Ni sites play a distinct role in facilitating the scission of C–H bonds, while the Mn sites exhibit a specific propensity towards breaking C–C bonds. The synergistic effect between Ni and Mn sites promoted the activation of ethane on the surface of Ni0.2Mn0.8Ox and decomposing into H2O and CO2 under the function of lattice oxygen. The monolithic catalysts demonstrated long-term stability, maintaining removal rates of ethane above 85 % under dry conditions and 75 % under wet conditions for up to 100 h. This performance suggests significant potential for industrial applications.

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来源期刊
Separation and Purification Technology
Separation and Purification Technology 工程技术-工程:化工
CiteScore
14.00
自引率
12.80%
发文量
2347
审稿时长
43 days
期刊介绍: Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.
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